30 male rat pups were exposed to 50 Hz electromagnetic field during in utero development for approximately 3 weeks and postnatal life for 5 weeks. Than one half of the pups was sacrificed immediately after last day of exposure and the other half was sacrificed after 8 weeks recovery period without exposure. The control group also consisted of 30 male pups.
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The investigated tissue was found disrupted at various layers in the exposed rats. This tissue showed infoldings, which were perhaps due to the loss of collagen and reticular fibrils from the inner and outer non-cellular layers. The outer non-cellular layer, which was thinner than that of the control group, was stripped away from the myoid cell (peritubular contractile cell) layer in multiple regions, giving a "blister-like" appearance. The myoid cells showed fewer poly-ribosomes, pinocytotic vesicles (fluid endocytosis) and glycogen granules. Most mitochondria were found to lack infoldings of the inner mitochondrial membrane, so called cristae. The connections between individual myoid cells were apparently lost. There were signs of regeneration in the recovery period.
These data suggest that the low frequency field exposure may cause profound changes in the boundary tissue of the seminiferous tubules.